Why do I have to keep resetting my password?

It used to be that when I went to the login page, I could enter everything normally without a worry. Now when I try to log in, I get an error message saying ‘Couldn’t find that username or email.’

I can still log back in when I select the ‘forgot password’ option and ‘reset’ my password, but it’s really annoying to do this every time that I want to log in. Please stop this.